Test Position

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kgburcham
Posts: 2016
Joined: Sun Feb 17, 2008 4:19 pm

Test Position

Post by kgburcham »

Rxd5

[d] r4r1k/1bq2pp1/2p1p2p/1pPnP1BQ/4B2P/1p4P1/P4P2/3RR1K1 w - - 0 1
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royb
Posts: 566
Joined: Thu Mar 09, 2006 12:53 am

Re: Test Position

Post by royb »

kgburcham wrote:Rxd5

[d] r4r1k/1bq2pp1/2p1p2p/1pPnP1BQ/4B2P/1p4P1/P4P2/3RR1K1 w - - 0 1
Glaurung 2.2 finds this one quickly on a Quad Q6700 at 2.67 GHz:

13 +0.88 1.Bxh6 f5 2.Bxd5 cxd5 3.Be3+ Kg8 4.axb3 Ra3 5.Qg6 Qc6 6.Rd4 Rxb3 7.Bh6 Rf7 8.Rc1 b4 9.Bg5 (1.98)
13 +1.84 1.Rxd5 f5 2.exf6 cxd5 3.fxg7+ Qxg7 4.Bg6 bxa2 5.Bxh6 a1=Q 6.Bxg7+ Kxg7 7.Qh7+ Kf6 8.Rxa1 Rxa1+ 9.Kg2 Ra7 10.Qh6 Rc8 11.Qg5+ Kg7 12.Bh5+ Kh7 13.Qg6+ Kh8 (3.23)
14 +2.98 1.Rxd5 f5 2.exf6 cxd5 3.fxg7+ Qxg7 4.Bg6 bxa2 5.Bxh6 a1=Q 6.Bxg7+ Kxg7 7.Qh7+ Kf6 8.Rxa1 Rxa1+ 9.Kg2 Ra7 10.Qh6 d4+ 11.Be4+ Ke7 12.c6 Bxc6 13.Bxc6 (4.55)
15 +2.66 1.Rxd5 f5 2.exf6 cxd5 3.fxg7+ Kxg7 4.Bxh6+ Kg8 5.Bxf8 Rxf8 6.Qg4+ Kh8 7.Qh5+ Kg8 8.Qg6+ Kh8 9.Qh6+ Kg8 10.Qxe6+ Qf7 11.Qxf7+ Kxf7 12.Bb1 bxa2 13.Bxa2 Bc6 (6.64)
16 +2.96 1.Rxd5 Kg8 2.Rdd1 bxa2 3.Bf6 Ra4 4.Qg4 g6 5.Qf4 Kh7 6.h5 Rfa8 7.hxg6+ fxg6 8.Qg4 Rxe4 9.Qxe4 Rg8 (11.83)
17 +2.92 1.Rxd5 Kg8 2.Rdd1 bxa2 3.Bf6 Ra4 4.Qg4 g6 5.Qf4 Kh7 6.h5 Rfa8 7.hxg6+ fxg6 8.Qg4 Rxe4 9.Qxe4 Rg8 10.Qf4 (16.06)
18 +3.45 1.Rxd5 Kg8 2.Rdd1 bxa2 3.Bf6 Ra4 4.Qg4 g6 5.h5 g5 6.Bxg5 f5 7.exf6 hxg5 8.Qxg5+ Kh8 9.Qh6+ Kg8 10.Qg6+ Kh8 11.h6 Rf7 12.h7 Rf8 13.g4 (25.39)
19 +3.47 1.Rxd5 Kg8 2.Rdd1 bxa2 3.Bf6 Ra4 4.Qg4 g6 5.h5 g5 6.Bxg5 f5 7.exf6 hxg5 8.Qxg5+ Kh8 9.Qh6+ Kg8 10.Qg6+ Kh8 11.h6 Rf7 12.h7 Rf8 13.Qh6 Qf7 (43.70)
20 +4.27 1.Rxd5 f5 2.exf6 cxd5 3.fxg7+ Qxg7 4.Bg6 Rf6 5.Bxf6 Qxf6 6.Qxh6+ Kg8 7.axb3 Bc8 8.Qh7+ Kf8 9.Qc7 Qxg6 10.Qc6 Ra2 11.Qxc8+ Ke7 12.Qc7+ Kf6 13.Qd8+ Kg7 14.Qe7+ Qf7 15.Rxe6 Qxe7 16.Rxe7+ Kf6 17.Re1 (155.99)

Glaurung 2.2 is much faster than Rybka-3 for this particular position.
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Terry McCracken
Posts: 16465
Joined: Wed Aug 01, 2007 4:16 am
Location: Canada

Re: Test Position

Post by Terry McCracken »

kgburcham wrote:Rxd5

[d] r4r1k/1bq2pp1/2p1p2p/1pPnP1BQ/4B2P/1p4P1/P4P2/3RR1K1 w - - 0 1
It's not very hard but I see why computers could get thrown off with other good moves like Bxh6 etc. However, Rxd5! is clearly the best move here.
Terry McCracken
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royb
Posts: 566
Joined: Thu Mar 09, 2006 12:53 am

Re: Test Position

Post by royb »

kgburcham wrote:Rxd5

[d] r4r1k/1bq2pp1/2p1p2p/1pPnP1BQ/4B2P/1p4P1/P4P2/3RR1K1 w - - 0 1
Naum4 also finds this quickly on a Q6700 at 2.67 GHz (4 CPUs):

12 +0.91 1.Bxh6 f5 2.Bxd5 cxd5 3.Be3+ Kg8 4.axb3 Ra3 5.Qg6 Qf7 6.Qxf7+ Kxf7 (0.51)
13 +0.72 1.axb3 Kg8 2.Rd4 g6 3.Qxh6 Qxe5 4.Rdd1 Qh8 5.Qxh8+ Kxh8 6.Ra1 Kg7 7.Kg2 (1.47)
14 +0.72 1.axb3 Kg8 2.Rd4 g6 3.Qxh6 Qxe5 4.Rdd1 Qh8 5.Qxh8+ Kxh8 6.Ra1 Kg7 7.Kg2 Nf6 (2.17)
14 +2.79 1.Rxd5 f5 2.exf6 cxd5 3.fxg7+ Qxg7 4.Bg6 bxa2 5.Bxh6 (15.60)
15 +2.79 1.Rxd5 f5 2.exf6 cxd5 3.fxg7+ Qxg7 4.Bg6 bxa2 5.Bxh6 (16.19)
16 +2.79 1.Rxd5 f5 2.exf6 cxd5 3.fxg7+ Qxg7 4.Bg6 bxa2 5.Bxh6 (18.64)
17 +3.17 1.Rxd5 f5 2.exf6 cxd5 3.fxg7+ Qxg7 4.Bg6 Rf6 5.Bxf6 Qxf6 6.Qxh6+ Kg8 7.axb3 Bc6 8.g4 d4 9.g5 (44.76)
18 +3.30 1.Rxd5 f5 2.exf6 cxd5 3.fxg7+ Qxg7 4.Bg6 Rf6 5.Bxf6 Qxf6 6.Qxh6+ Kg8 7.axb3 Bc6 8.g4 d4 9.g5 Qg7 (73.19)
19 +3.38 1.Rxd5 f5 2.exf6 cxd5 3.fxg7+ Qxg7 4.Bg6 bxa2 5.Bxh6 (121.91)
20 +3.53 1.Rxd5 f5 2.exf6 cxd5 3.fxg7+ Qxg7 4.Bg6 Rf6 5.Bxf6 Qxf6 6.Qxh6+ Kg8 7.axb3 Bc6 8.g4 d4 9.g5 Qg7 10.Bh7+ Qxh7 (351.83)
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swami
Posts: 6662
Joined: Thu Mar 09, 2006 4:21 am

Re: Test Position

Post by swami »

CCT Version of Bright:
  • Analysis by bright-0.4-cct1:

    1.Bxd5 cxd5
    -/+ (-0.82) Depth: 1/4 00:00:00
    1.Bxh6
    +/- (1.14) Depth: 2/7 00:00:00
    1.Bxh6
    +/- (1.14) Depth: 2/7 00:00:00
    1.Bxh6 g6 2.Qg5 bxa2 3.Bxf8 Rxf8
    = (-0.07) Depth: 3/13 00:00:00
    1.Bxh6 g6 2.Qg5 bxa2 3.Bxf8 Rxf8
    = (-0.07) Depth: 3/13 00:00:00
    1.axb3 Kg8 2.Re2
    +/= (0.64) Depth: 3/13 00:00:00
    1.axb3 Kg8 2.Re2 Nc3
    +/= (0.61) Depth: 4/13 00:00:00
    1.axb3 Kg8 2.Bd3 Ra2 3.Rd2
    = (0.10) Depth: 5/13 00:00:00
    1.Bxh6 f5 2.Bxd5 cxd5 3.axb3 gxh6 4.Qxh6+ Kg8 5.Qxe6+ Kg7
    +/= (0.57) Depth: 5/18 00:00:00
    1.Bxh6 f5 2.Bxd5 cxd5 3.axb3 gxh6 4.Qxh6+ Kg8 5.Qxe6+ Kg7
    +/= (0.57) Depth: 6/18 00:00:00 40kN
    1.Bxh6 f5 2.Bxd5 cxd5 3.axb3 gxh6 4.Qxh6+ Kg8 5.Qxe6+ Kg7
    +/= (0.57) Depth: 7/23 00:00:00 91kN
    1.Bxh6 f5 2.Bxd5 cxd5 3.axb3 gxh6 4.Qxh6+ Qh7 5.Qxe6 Ra2
    +/= (0.67) Depth: 8/25 00:00:00 232kN
    1.Rxd5 f5 2.exf6 cxd5 3.fxg7+ Qxg7 4.Bxh6 Qf7 5.Qe5+ Qf6
    +- (1.55) Depth: 8/31 00:00:00 610kN
    1.Rxd5 f5 2.exf6 cxd5 3.Bf4 bxa2 4.Bxc7 a1Q 5.fxg7+ Qxg7 6.Be5 Rf6 7.Bxf6 Qxf6
    +/- (1.26) Depth: 9/31 00:00:00 793kN
    1.Rxd5 f5 2.exf6 cxd5 3.Bf4 Qf7 4.fxg7+ Qxg7 5.Be5 Rf6 6.Bxf6 Qxf6
    +/- (1.33) Depth: 10/31 00:00:00 1233kN
    1.Rxd5 f5 2.exf6 cxd5 3.Bf4 Qf7 4.fxg7+ Qxg7 5.Be5 Rf6 6.Bxf6 Qxf6
    +/- (1.33) Depth: 11/33 00:00:00 2085kN
    1.Rxd5 f5 2.exf6 cxd5 3.fxg7+ Qxg7 4.Bg6 bxa2 5.Bxh6 a1Q 6.Bxg7+ Kxg7 7.Qh7+ Kf6 8.Rxa1 Rxa1+ 9.Kg2
    +/- (1.14) Depth: 12/42 00:00:01 4731kN
    1.Rxd5 f5 2.exf6 cxd5 3.fxg7+ Qxg7 4.Bg6 bxa2 5.Bxh6 a1Q 6.Bxg7+ Kxg7 7.Qh7+ Kf6 8.Rxa1 Rxa1+ 9.Kg2 Bc6
    +/- (1.09) Depth: 13/42 00:00:03 12827kN
    1.axb3 Kg8 2.Bxh6 f5 3.exf6 Nxf6 4.Qg5 Kh8 5.Bg6 gxh6 6.Qxh6+ Kg8 7.Rxe6 Ng4 8.Bh7+ Qxh7 9.Qg5+ Kh8 10.Qxg4
    +/- (1.13) Depth: 13/42 00:00:05 22428kN
    1.axb3 f5 2.exf6 Nxf6 3.Bxf6 Rxf6 4.Ra1 Rc8 5.f4 Rd8 6.Red1 Kg8 7.b4 Qe7 8.Rxd8+ Qxd8 9.Qe5 Qf8
    +/- (1.21) Depth: 14/44 00:00:11 52890kN
    1.axb3 f5 2.exf6 Nxf6 3.Bxf6 Rxf6 4.Ra1 Rc8 5.f4 Rd8 6.Red1 Kg8 7.b4 Qe7 8.Rxd8+ Qxd8 9.Qe5 Qe7 10.Ra7
    +/- (1.35) Depth: 15/44 00:00:21 100mN
    1.Rxd5 f5 2.exf6 cxd5 3.fxg7+ Qxg7 4.Bg6 bxa2 5.Bxh6 a1Q 6.Bxg7+ Kxg7 7.Qh7+ Kf6 8.Rxa1 Rxa1+ 9.Kg2 Ba8 10.Qh6 d4+ 11.Be4+ Ke5 12.Qg7+ Kxe4 13.Qxf8
    +- (1.88) Depth: 15/49 00:00:31 144mN
    1.Rxd5 f5 2.exf6 cxd5 3.fxg7+ Qxg7 4.Bg6 bxa2 5.Bxh6 a1Q 6.Bxg7+ Kxg7 7.Qh7+ Kf6 8.Rxa1 Rxa1+ 9.Kg2 d4+ 10.Qxb7 Kxg6 11.Qe4+ Kf7 12.Qxd4 Ra7
    +- (2.33) Depth: 16/50 00:00:47 209mN
    1.Rxd5 f5 2.exf6 cxd5 3.fxg7+ Qxg7 4.Bg6 bxa2 5.Bxh6 a1Q 6.Bxg7+ Kxg7 7.Qh7+ Kf6 8.Rxa1 Rxa1+ 9.Kg2 d4+ 10.Qxb7 Kxg6 11.Qe4+ Kf7 12.Qxd4 Ra7 13.g4
    +- (2.62) Depth: 17/56 00:01:23 374mN
    1.Rxd5 f5 2.exf6 cxd5 3.fxg7+ Qxg7 4.Bg6 bxa2 5.Bxh6 a1Q 6.Bxg7+ Kxg7 7.Qh7+ Kf6 8.Rxa1 Rxa1+ 9.Kg2 d4+ 10.Qxb7 Kxg6 11.Qe7 Rfa8 12.Qxe6+ Kg7 13.Qd7+ Kg6 14.Qxd4
    +- (3.07) Depth: 18/62 00:02:36 718mN
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